Spark-plug.



F. J. HEASEL.

SPARK PLUG.

APPLIOATION FILED PEBJS, 1909.

958,247. Patented May 17, 1910.

(JD/D163 I S/VVU @YbCO/L @J QM FREDERICK J. HEASEL, OF CINCINNATI, OHIO.

SPARK-PLUG.

Specification of Letters Patent.

Patented May 17, 1910.

Application filed February 18, 1909. Serial No. 478,706.

To allwhom it may concern:

Be it known that I, FRnnnRIcK J. HEASEL,

a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented new and useful Imlprovements in S ark-Plugs, of which the fo owing is a speci cation.

My invention relates to devices designed to reduce an electric spark to ignite the gas wit in the cylinder of an explosion-engine. Spch devices are commonly known as sparkp u s.

T e particular objects of my invention are, 1st, to prevent excessive heatin of the sparking points or electrodes; 2n to provide for easy regulation of the distance between the points without bending or mutilating any parts, and, 3rd, to insure the reg ular formation of sparks by maintaining a ga between the spark points.

gther plugs produce the sparks within the cylinder chamber itself, Where the high tension point is constantly exposed to extremely high temperatures, becoming red hot and causing premature explosion, while in my device the s ark, is produced within a chamber of the evice itself, opening into the cylinder chamber. As the cylinder is water jacketed the temperature of the spark plug is constantly decreased by the water in the water jacket of the cylinder; and the high tension electrode is made hollow and open at its outer end to gain the cooling effect of the air therein. The position of ,the sparking points, and the formation of the plug shell, keeps any excess of cylinder oil rom bridging the space between the electrodes; hence constant formation of sparks is possible.

My invention-is illustrated in the accompanying drawings, in whichigure 1 is. a Ian view of the complete spark lug, wit engine cylinder broken away, s owing only contiguous parts. Fig. 2 an axial section of the plug. Fig. 3 is a plin view of the inner end of the plug.

11 the drawings a water jacketed explosion engine 0 linderwith inner shell, M, and outer she 1, M, with water space, m, between, is drilled and threaded and the bushing N fitted therein.

A, that portion of the spark lug shell whose closed end is threade to enter the bushin N, is provided with a ortion, a, shape for wrench contact, and

as its open end threaded to form with the cylinder plug, A a stuffing box. The shell A has its closed end, perforated axially, the perforation threaded to receive the adjustable, low tension sparking point, B, and other perforations, a adapted to connect the interior chamber, a, of the shell, A, with the interior of the engine cylinder when the plug is in osition.

The'high tension e ectrode, C, is a hollow stem, open at its outer end, which is threaded exteriorl to receive the nut, D, and the lock nut, A circumferential lug, c, is adapted to fit leak tight against the packin ring, F, seated against a shoulder, 9 forme by the enlarged bore, 9 of the axial perforaprovided with a packing washer, H, and when the nut D, and the lock nut, E, are screwed down tight,the electrode, C, the insulator, G, and their fittings form one detachable art of the spark lug. The circumferential ug, g, has a pac ing ring, I, on its outer side adapted to seat against the shoulder, a of the shell A; and a packing ring, J, on its outer side adapted to contact with the inner end of the cylindrical plug A When the insulator, G, with electrode 0, fixed therein, is fitted into place in the shell A and the plug A is screwed into position the whole devlce is integral and readily screwed into position upon the engine cylinder. These plugs may be screwed into the cylinder in any posit1on that will allow the oil thrown from the engine cylinder into the plug chamber, a to drain ofl through the perforations, a

It will be understood that the sparking point, B, makes the ground or low tension electrical connection and the point C, is provided with the high tension connection to com lete the circuit.

It will be seen that the water when circulated in the'water s ace, m, of the cylinder MM constantly tends to cool the bushing N, and the contiguous portion of the plug shell, A, including the sparking point, B, and as all portions of the surrounding plug shell are kept from reaching high temperatures there is a constant tendency to keep down the temperature of the sparking point, C.

I claim as new and desire to secure by Letters Patent of the United States:

A sparkin device embodying in combination a cylin rical casing open at the outer end and closed at the inner endby a pertion, g, of the insulator, G. The nut D is also forated wall and exteriorly screw-threaded to seat in the c linder shell with its inner end substantial flush with the interior surface of the cy inder; a low tension s arking electrode ad'ustably seated axial y in and projecting t rough said end Wall; an insulatin plug axially perforated, countersunk an of reduced external diameter at its inner end, and projecting outwardly through the casing and secured thereto; a high tension electrode carried axially Mam? atmosphere.

In testimony-whereof I have hereunto set my hand in presence of two subscribing wit- FREDERICK J. HEASEL.

nesses.

Witnesses: v

WALTER A. KNIGHT, M. A. lJAoKsoN. 

